SemaExpr.cpp revision 5205938085c9bb3123b20745be5719d8d3be4b60
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Lex/LiteralSupport.h" 21#include "clang/Basic/Diagnostic.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Scope.h" 26using namespace clang; 27 28//===----------------------------------------------------------------------===// 29// Standard Promotions and Conversions 30//===----------------------------------------------------------------------===// 31 32/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 33void Sema::DefaultFunctionArrayConversion(Expr *&E) { 34 QualType Ty = E->getType(); 35 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 36 37 if (const ReferenceType *ref = Ty->getAsReferenceType()) { 38 ImpCastExprToType(E, ref->getPointeeType()); // C++ [expr] 39 Ty = E->getType(); 40 } 41 if (Ty->isFunctionType()) 42 ImpCastExprToType(E, Context.getPointerType(Ty)); 43 else if (Ty->isArrayType()) { 44 // In C90 mode, arrays only promote to pointers if the array expression is 45 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 46 // type 'array of type' is converted to an expression that has type 'pointer 47 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 48 // that has type 'array of type' ...". The relevant change is "an lvalue" 49 // (C90) to "an expression" (C99). 50 // 51 // C++ 4.2p1: 52 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 53 // T" can be converted to an rvalue of type "pointer to T". 54 // 55 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 56 E->isLvalue(Context) == Expr::LV_Valid) 57 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 58 } 59} 60 61/// UsualUnaryConversions - Performs various conversions that are common to most 62/// operators (C99 6.3). The conversions of array and function types are 63/// sometimes surpressed. For example, the array->pointer conversion doesn't 64/// apply if the array is an argument to the sizeof or address (&) operators. 65/// In these instances, this routine should *not* be called. 66Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 67 QualType Ty = Expr->getType(); 68 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 69 70 if (const ReferenceType *Ref = Ty->getAsReferenceType()) { 71 ImpCastExprToType(Expr, Ref->getPointeeType()); // C++ [expr] 72 Ty = Expr->getType(); 73 } 74 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 75 ImpCastExprToType(Expr, Context.IntTy); 76 else 77 DefaultFunctionArrayConversion(Expr); 78 79 return Expr; 80} 81 82/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 83/// do not have a prototype. Arguments that have type float are promoted to 84/// double. All other argument types are converted by UsualUnaryConversions(). 85void Sema::DefaultArgumentPromotion(Expr *&Expr) { 86 QualType Ty = Expr->getType(); 87 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 88 89 // If this is a 'float' (CVR qualified or typedef) promote to double. 90 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 91 if (BT->getKind() == BuiltinType::Float) 92 return ImpCastExprToType(Expr, Context.DoubleTy); 93 94 UsualUnaryConversions(Expr); 95} 96 97/// UsualArithmeticConversions - Performs various conversions that are common to 98/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 99/// routine returns the first non-arithmetic type found. The client is 100/// responsible for emitting appropriate error diagnostics. 101/// FIXME: verify the conversion rules for "complex int" are consistent with 102/// GCC. 103QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 104 bool isCompAssign) { 105 if (!isCompAssign) { 106 UsualUnaryConversions(lhsExpr); 107 UsualUnaryConversions(rhsExpr); 108 } 109 // For conversion purposes, we ignore any qualifiers. 110 // For example, "const float" and "float" are equivalent. 111 QualType lhs = 112 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 113 QualType rhs = 114 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 115 116 // If both types are identical, no conversion is needed. 117 if (lhs == rhs) 118 return lhs; 119 120 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 121 // The caller can deal with this (e.g. pointer + int). 122 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 123 return lhs; 124 125 // At this point, we have two different arithmetic types. 126 127 // Handle complex types first (C99 6.3.1.8p1). 128 if (lhs->isComplexType() || rhs->isComplexType()) { 129 // if we have an integer operand, the result is the complex type. 130 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 131 // convert the rhs to the lhs complex type. 132 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 133 return lhs; 134 } 135 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 136 // convert the lhs to the rhs complex type. 137 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 138 return rhs; 139 } 140 // This handles complex/complex, complex/float, or float/complex. 141 // When both operands are complex, the shorter operand is converted to the 142 // type of the longer, and that is the type of the result. This corresponds 143 // to what is done when combining two real floating-point operands. 144 // The fun begins when size promotion occur across type domains. 145 // From H&S 6.3.4: When one operand is complex and the other is a real 146 // floating-point type, the less precise type is converted, within it's 147 // real or complex domain, to the precision of the other type. For example, 148 // when combining a "long double" with a "double _Complex", the 149 // "double _Complex" is promoted to "long double _Complex". 150 int result = Context.getFloatingTypeOrder(lhs, rhs); 151 152 if (result > 0) { // The left side is bigger, convert rhs. 153 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 154 if (!isCompAssign) 155 ImpCastExprToType(rhsExpr, rhs); 156 } else if (result < 0) { // The right side is bigger, convert lhs. 157 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 158 if (!isCompAssign) 159 ImpCastExprToType(lhsExpr, lhs); 160 } 161 // At this point, lhs and rhs have the same rank/size. Now, make sure the 162 // domains match. This is a requirement for our implementation, C99 163 // does not require this promotion. 164 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 165 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 166 if (!isCompAssign) 167 ImpCastExprToType(lhsExpr, rhs); 168 return rhs; 169 } else { // handle "_Complex double, double". 170 if (!isCompAssign) 171 ImpCastExprToType(rhsExpr, lhs); 172 return lhs; 173 } 174 } 175 return lhs; // The domain/size match exactly. 176 } 177 // Now handle "real" floating types (i.e. float, double, long double). 178 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 179 // if we have an integer operand, the result is the real floating type. 180 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 181 // convert rhs to the lhs floating point type. 182 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 183 return lhs; 184 } 185 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 186 // convert lhs to the rhs floating point type. 187 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 188 return rhs; 189 } 190 // We have two real floating types, float/complex combos were handled above. 191 // Convert the smaller operand to the bigger result. 192 int result = Context.getFloatingTypeOrder(lhs, rhs); 193 194 if (result > 0) { // convert the rhs 195 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 196 return lhs; 197 } 198 if (result < 0) { // convert the lhs 199 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 200 return rhs; 201 } 202 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 203 } 204 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 205 // Handle GCC complex int extension. 206 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 207 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 208 209 if (lhsComplexInt && rhsComplexInt) { 210 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 211 rhsComplexInt->getElementType()) >= 0) { 212 // convert the rhs 213 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 214 return lhs; 215 } 216 if (!isCompAssign) 217 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 218 return rhs; 219 } else if (lhsComplexInt && rhs->isIntegerType()) { 220 // convert the rhs to the lhs complex type. 221 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 222 return lhs; 223 } else if (rhsComplexInt && lhs->isIntegerType()) { 224 // convert the lhs to the rhs complex type. 225 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 226 return rhs; 227 } 228 } 229 // Finally, we have two differing integer types. 230 // The rules for this case are in C99 6.3.1.8 231 int compare = Context.getIntegerTypeOrder(lhs, rhs); 232 bool lhsSigned = lhs->isSignedIntegerType(), 233 rhsSigned = rhs->isSignedIntegerType(); 234 QualType destType; 235 if (lhsSigned == rhsSigned) { 236 // Same signedness; use the higher-ranked type 237 destType = compare >= 0 ? lhs : rhs; 238 } else if (compare != (lhsSigned ? 1 : -1)) { 239 // The unsigned type has greater than or equal rank to the 240 // signed type, so use the unsigned type 241 destType = lhsSigned ? rhs : lhs; 242 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 243 // The two types are different widths; if we are here, that 244 // means the signed type is larger than the unsigned type, so 245 // use the signed type. 246 destType = lhsSigned ? lhs : rhs; 247 } else { 248 // The signed type is higher-ranked than the unsigned type, 249 // but isn't actually any bigger (like unsigned int and long 250 // on most 32-bit systems). Use the unsigned type corresponding 251 // to the signed type. 252 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 253 } 254 if (!isCompAssign) { 255 ImpCastExprToType(lhsExpr, destType); 256 ImpCastExprToType(rhsExpr, destType); 257 } 258 return destType; 259} 260 261//===----------------------------------------------------------------------===// 262// Semantic Analysis for various Expression Types 263//===----------------------------------------------------------------------===// 264 265 266/// ActOnStringLiteral - The specified tokens were lexed as pasted string 267/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 268/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 269/// multiple tokens. However, the common case is that StringToks points to one 270/// string. 271/// 272Action::ExprResult 273Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 274 assert(NumStringToks && "Must have at least one string!"); 275 276 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 277 if (Literal.hadError) 278 return ExprResult(true); 279 280 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 281 for (unsigned i = 0; i != NumStringToks; ++i) 282 StringTokLocs.push_back(StringToks[i].getLocation()); 283 284 // Verify that pascal strings aren't too large. 285 if (Literal.Pascal && Literal.GetStringLength() > 256) 286 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 287 SourceRange(StringToks[0].getLocation(), 288 StringToks[NumStringToks-1].getLocation())); 289 290 QualType StrTy = Context.CharTy; 291 if (Literal.AnyWide) StrTy = Context.getWCharType(); 292 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 293 294 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 295 if (getLangOptions().CPlusPlus) 296 StrTy.addConst(); 297 298 // Get an array type for the string, according to C99 6.4.5. This includes 299 // the nul terminator character as well as the string length for pascal 300 // strings. 301 StrTy = Context.getConstantArrayType(StrTy, 302 llvm::APInt(32, Literal.GetStringLength()+1), 303 ArrayType::Normal, 0); 304 305 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 306 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 307 Literal.AnyWide, StrTy, 308 StringToks[0].getLocation(), 309 StringToks[NumStringToks-1].getLocation()); 310} 311 312/// ActOnIdentifierExpr - The parser read an identifier in expression context, 313/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 314/// identifier is used in a function call context. 315Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 316 IdentifierInfo &II, 317 bool HasTrailingLParen) { 318 // Could be enum-constant, value decl, instance variable, etc. 319 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 320 321 // If this reference is in an Objective-C method, then ivar lookup happens as 322 // well. 323 if (getCurMethodDecl()) { 324 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 325 // There are two cases to handle here. 1) scoped lookup could have failed, 326 // in which case we should look for an ivar. 2) scoped lookup could have 327 // found a decl, but that decl is outside the current method (i.e. a global 328 // variable). In these two cases, we do a lookup for an ivar with this 329 // name, if the lookup suceeds, we replace it our current decl. 330 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 331 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 332 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II)) { 333 // FIXME: This should use a new expr for a direct reference, don't turn 334 // this into Self->ivar, just return a BareIVarExpr or something. 335 IdentifierInfo &II = Context.Idents.get("self"); 336 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 337 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 338 static_cast<Expr*>(SelfExpr.Val), true, true); 339 } 340 } 341 // Needed to implement property "super.method" notation. 342 if (SD == 0 && &II == SuperID) { 343 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 344 getCurMethodDecl()->getClassInterface())); 345 return new PredefinedExpr(Loc, T, PredefinedExpr::ObjCSuper); 346 } 347 } 348 if (D == 0) { 349 // Otherwise, this could be an implicitly declared function reference (legal 350 // in C90, extension in C99). 351 if (HasTrailingLParen && 352 !getLangOptions().CPlusPlus) // Not in C++. 353 D = ImplicitlyDefineFunction(Loc, II, S); 354 else { 355 // If this name wasn't predeclared and if this is not a function call, 356 // diagnose the problem. 357 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 358 } 359 } 360 361 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 362 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 363 if (MD->isStatic()) 364 // "invalid use of member 'x' in static member function" 365 return Diag(Loc, diag::err_invalid_member_use_in_static_method, 366 FD->getName()); 367 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 368 // "invalid use of nonstatic data member 'x'" 369 return Diag(Loc, diag::err_invalid_non_static_member_use, 370 FD->getName()); 371 372 if (FD->isInvalidDecl()) 373 return true; 374 375 // FIXME: Use DeclRefExpr or a new Expr for a direct CXXField reference. 376 ExprResult ThisExpr = ActOnCXXThis(SourceLocation()); 377 return new MemberExpr(static_cast<Expr*>(ThisExpr.Val), 378 true, FD, Loc, FD->getType()); 379 } 380 381 return Diag(Loc, diag::err_invalid_non_static_member_use, FD->getName()); 382 } 383 if (isa<TypedefDecl>(D)) 384 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 385 if (isa<ObjCInterfaceDecl>(D)) 386 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 387 if (isa<NamespaceDecl>(D)) 388 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 389 390 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 391 ValueDecl *VD = cast<ValueDecl>(D); 392 393 // check if referencing an identifier with __attribute__((deprecated)). 394 if (VD->getAttr<DeprecatedAttr>()) 395 Diag(Loc, diag::warn_deprecated, VD->getName()); 396 397 // Only create DeclRefExpr's for valid Decl's. 398 if (VD->isInvalidDecl()) 399 return true; 400 401 // FIXME: This will create BlockDeclRefExprs for global variables, 402 // function references, etc which is suboptimal :) and breaks 403 // things like "integer constant expression" tests. 404 // 405 if (CurBlock && (CurBlock->TheDecl != VD->getDeclContext()) && 406 !isa<EnumConstantDecl>(VD)) { 407 // If we are in a block and the variable is outside the current block, 408 // bind the variable reference with a BlockDeclRefExpr. 409 410 // The BlocksAttr indicates the variable is bound by-reference. 411 if (VD->getAttr<BlocksAttr>()) 412 return new BlockDeclRefExpr(VD, VD->getType(), Loc, true); 413 414 // Variable will be bound by-copy, make it const within the closure. 415 VD->getType().addConst(); 416 return new BlockDeclRefExpr(VD, VD->getType(), Loc, false); 417 } 418 // If this reference is not in a block or if the referenced variable is 419 // within the block, create a normal DeclRefExpr. 420 return new DeclRefExpr(VD, VD->getType(), Loc); 421} 422 423Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 424 tok::TokenKind Kind) { 425 PredefinedExpr::IdentType IT; 426 427 switch (Kind) { 428 default: assert(0 && "Unknown simple primary expr!"); 429 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 430 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 431 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 432 } 433 434 // Verify that this is in a function context. 435 if (getCurFunctionDecl() == 0 && getCurMethodDecl() == 0) 436 return Diag(Loc, diag::err_predef_outside_function); 437 438 // Pre-defined identifiers are of type char[x], where x is the length of the 439 // string. 440 unsigned Length; 441 if (getCurFunctionDecl()) 442 Length = getCurFunctionDecl()->getIdentifier()->getLength(); 443 else 444 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 445 446 llvm::APInt LengthI(32, Length + 1); 447 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 448 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 449 return new PredefinedExpr(Loc, ResTy, IT); 450} 451 452Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 453 llvm::SmallString<16> CharBuffer; 454 CharBuffer.resize(Tok.getLength()); 455 const char *ThisTokBegin = &CharBuffer[0]; 456 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 457 458 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 459 Tok.getLocation(), PP); 460 if (Literal.hadError()) 461 return ExprResult(true); 462 463 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 464 465 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 466 Tok.getLocation()); 467} 468 469Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 470 // fast path for a single digit (which is quite common). A single digit 471 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 472 if (Tok.getLength() == 1) { 473 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 474 475 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 476 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 477 Context.IntTy, 478 Tok.getLocation())); 479 } 480 llvm::SmallString<512> IntegerBuffer; 481 // Add padding so that NumericLiteralParser can overread by one character. 482 IntegerBuffer.resize(Tok.getLength()+1); 483 const char *ThisTokBegin = &IntegerBuffer[0]; 484 485 // Get the spelling of the token, which eliminates trigraphs, etc. 486 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 487 488 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 489 Tok.getLocation(), PP); 490 if (Literal.hadError) 491 return ExprResult(true); 492 493 Expr *Res; 494 495 if (Literal.isFloatingLiteral()) { 496 QualType Ty; 497 if (Literal.isFloat) 498 Ty = Context.FloatTy; 499 else if (!Literal.isLong) 500 Ty = Context.DoubleTy; 501 else 502 Ty = Context.LongDoubleTy; 503 504 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 505 506 // isExact will be set by GetFloatValue(). 507 bool isExact = false; 508 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 509 Ty, Tok.getLocation()); 510 511 } else if (!Literal.isIntegerLiteral()) { 512 return ExprResult(true); 513 } else { 514 QualType Ty; 515 516 // long long is a C99 feature. 517 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 518 Literal.isLongLong) 519 Diag(Tok.getLocation(), diag::ext_longlong); 520 521 // Get the value in the widest-possible width. 522 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 523 524 if (Literal.GetIntegerValue(ResultVal)) { 525 // If this value didn't fit into uintmax_t, warn and force to ull. 526 Diag(Tok.getLocation(), diag::warn_integer_too_large); 527 Ty = Context.UnsignedLongLongTy; 528 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 529 "long long is not intmax_t?"); 530 } else { 531 // If this value fits into a ULL, try to figure out what else it fits into 532 // according to the rules of C99 6.4.4.1p5. 533 534 // Octal, Hexadecimal, and integers with a U suffix are allowed to 535 // be an unsigned int. 536 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 537 538 // Check from smallest to largest, picking the smallest type we can. 539 unsigned Width = 0; 540 if (!Literal.isLong && !Literal.isLongLong) { 541 // Are int/unsigned possibilities? 542 unsigned IntSize = Context.Target.getIntWidth(); 543 544 // Does it fit in a unsigned int? 545 if (ResultVal.isIntN(IntSize)) { 546 // Does it fit in a signed int? 547 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 548 Ty = Context.IntTy; 549 else if (AllowUnsigned) 550 Ty = Context.UnsignedIntTy; 551 Width = IntSize; 552 } 553 } 554 555 // Are long/unsigned long possibilities? 556 if (Ty.isNull() && !Literal.isLongLong) { 557 unsigned LongSize = Context.Target.getLongWidth(); 558 559 // Does it fit in a unsigned long? 560 if (ResultVal.isIntN(LongSize)) { 561 // Does it fit in a signed long? 562 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 563 Ty = Context.LongTy; 564 else if (AllowUnsigned) 565 Ty = Context.UnsignedLongTy; 566 Width = LongSize; 567 } 568 } 569 570 // Finally, check long long if needed. 571 if (Ty.isNull()) { 572 unsigned LongLongSize = Context.Target.getLongLongWidth(); 573 574 // Does it fit in a unsigned long long? 575 if (ResultVal.isIntN(LongLongSize)) { 576 // Does it fit in a signed long long? 577 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 578 Ty = Context.LongLongTy; 579 else if (AllowUnsigned) 580 Ty = Context.UnsignedLongLongTy; 581 Width = LongLongSize; 582 } 583 } 584 585 // If we still couldn't decide a type, we probably have something that 586 // does not fit in a signed long long, but has no U suffix. 587 if (Ty.isNull()) { 588 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 589 Ty = Context.UnsignedLongLongTy; 590 Width = Context.Target.getLongLongWidth(); 591 } 592 593 if (ResultVal.getBitWidth() != Width) 594 ResultVal.trunc(Width); 595 } 596 597 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 598 } 599 600 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 601 if (Literal.isImaginary) 602 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 603 604 return Res; 605} 606 607Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 608 ExprTy *Val) { 609 Expr *E = (Expr *)Val; 610 assert((E != 0) && "ActOnParenExpr() missing expr"); 611 return new ParenExpr(L, R, E); 612} 613 614/// The UsualUnaryConversions() function is *not* called by this routine. 615/// See C99 6.3.2.1p[2-4] for more details. 616QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 617 SourceLocation OpLoc, 618 const SourceRange &ExprRange, 619 bool isSizeof) { 620 // C99 6.5.3.4p1: 621 if (isa<FunctionType>(exprType) && isSizeof) 622 // alignof(function) is allowed. 623 Diag(OpLoc, diag::ext_sizeof_function_type, ExprRange); 624 else if (exprType->isVoidType()) 625 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof", 626 ExprRange); 627 else if (exprType->isIncompleteType()) { 628 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 629 diag::err_alignof_incomplete_type, 630 exprType.getAsString(), ExprRange); 631 return QualType(); // error 632 } 633 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 634 return Context.getSizeType(); 635} 636 637Action::ExprResult Sema:: 638ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 639 SourceLocation LPLoc, TypeTy *Ty, 640 SourceLocation RPLoc) { 641 // If error parsing type, ignore. 642 if (Ty == 0) return true; 643 644 // Verify that this is a valid expression. 645 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 646 647 QualType resultType = 648 CheckSizeOfAlignOfOperand(ArgTy, OpLoc, SourceRange(LPLoc, RPLoc),isSizeof); 649 650 if (resultType.isNull()) 651 return true; 652 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 653} 654 655QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 656 DefaultFunctionArrayConversion(V); 657 658 // These operators return the element type of a complex type. 659 if (const ComplexType *CT = V->getType()->getAsComplexType()) 660 return CT->getElementType(); 661 662 // Otherwise they pass through real integer and floating point types here. 663 if (V->getType()->isArithmeticType()) 664 return V->getType(); 665 666 // Reject anything else. 667 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 668 return QualType(); 669} 670 671 672 673Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 674 tok::TokenKind Kind, 675 ExprTy *Input) { 676 UnaryOperator::Opcode Opc; 677 switch (Kind) { 678 default: assert(0 && "Unknown unary op!"); 679 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 680 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 681 } 682 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 683 if (result.isNull()) 684 return true; 685 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 686} 687 688Action::ExprResult Sema:: 689ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 690 ExprTy *Idx, SourceLocation RLoc) { 691 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 692 693 // Perform default conversions. 694 DefaultFunctionArrayConversion(LHSExp); 695 DefaultFunctionArrayConversion(RHSExp); 696 697 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 698 699 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 700 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 701 // in the subscript position. As a result, we need to derive the array base 702 // and index from the expression types. 703 Expr *BaseExpr, *IndexExpr; 704 QualType ResultType; 705 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 706 BaseExpr = LHSExp; 707 IndexExpr = RHSExp; 708 // FIXME: need to deal with const... 709 ResultType = PTy->getPointeeType(); 710 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 711 // Handle the uncommon case of "123[Ptr]". 712 BaseExpr = RHSExp; 713 IndexExpr = LHSExp; 714 // FIXME: need to deal with const... 715 ResultType = PTy->getPointeeType(); 716 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 717 BaseExpr = LHSExp; // vectors: V[123] 718 IndexExpr = RHSExp; 719 720 // Component access limited to variables (reject vec4.rg[1]). 721 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 722 !isa<ExtVectorElementExpr>(BaseExpr)) 723 return Diag(LLoc, diag::err_ext_vector_component_access, 724 SourceRange(LLoc, RLoc)); 725 // FIXME: need to deal with const... 726 ResultType = VTy->getElementType(); 727 } else { 728 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 729 RHSExp->getSourceRange()); 730 } 731 // C99 6.5.2.1p1 732 if (!IndexExpr->getType()->isIntegerType()) 733 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 734 IndexExpr->getSourceRange()); 735 736 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 737 // the following check catches trying to index a pointer to a function (e.g. 738 // void (*)(int)) and pointers to incomplete types. Functions are not 739 // objects in C99. 740 if (!ResultType->isObjectType()) 741 return Diag(BaseExpr->getLocStart(), 742 diag::err_typecheck_subscript_not_object, 743 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 744 745 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 746} 747 748QualType Sema:: 749CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 750 IdentifierInfo &CompName, SourceLocation CompLoc) { 751 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 752 753 // This flag determines whether or not the component is to be treated as a 754 // special name, or a regular GLSL-style component access. 755 bool SpecialComponent = false; 756 757 // The vector accessor can't exceed the number of elements. 758 const char *compStr = CompName.getName(); 759 if (strlen(compStr) > vecType->getNumElements()) { 760 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 761 baseType.getAsString(), SourceRange(CompLoc)); 762 return QualType(); 763 } 764 765 // Check that we've found one of the special components, or that the component 766 // names must come from the same set. 767 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 768 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 769 SpecialComponent = true; 770 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 771 do 772 compStr++; 773 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 774 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 775 do 776 compStr++; 777 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 778 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 779 do 780 compStr++; 781 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 782 } 783 784 if (!SpecialComponent && *compStr) { 785 // We didn't get to the end of the string. This means the component names 786 // didn't come from the same set *or* we encountered an illegal name. 787 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 788 std::string(compStr,compStr+1), SourceRange(CompLoc)); 789 return QualType(); 790 } 791 // Each component accessor can't exceed the vector type. 792 compStr = CompName.getName(); 793 while (*compStr) { 794 if (vecType->isAccessorWithinNumElements(*compStr)) 795 compStr++; 796 else 797 break; 798 } 799 if (!SpecialComponent && *compStr) { 800 // We didn't get to the end of the string. This means a component accessor 801 // exceeds the number of elements in the vector. 802 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 803 baseType.getAsString(), SourceRange(CompLoc)); 804 return QualType(); 805 } 806 807 // If we have a special component name, verify that the current vector length 808 // is an even number, since all special component names return exactly half 809 // the elements. 810 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 811 Diag(OpLoc, diag::err_ext_vector_component_requires_even, 812 baseType.getAsString(), SourceRange(CompLoc)); 813 return QualType(); 814 } 815 816 // The component accessor looks fine - now we need to compute the actual type. 817 // The vector type is implied by the component accessor. For example, 818 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 819 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 820 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 821 : strlen(CompName.getName()); 822 if (CompSize == 1) 823 return vecType->getElementType(); 824 825 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 826 // Now look up the TypeDefDecl from the vector type. Without this, 827 // diagostics look bad. We want extended vector types to appear built-in. 828 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 829 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 830 return Context.getTypedefType(ExtVectorDecls[i]); 831 } 832 return VT; // should never get here (a typedef type should always be found). 833} 834 835/// constructSetterName - Return the setter name for the given 836/// identifier, i.e. "set" + Name where the initial character of Name 837/// has been capitalized. 838// FIXME: Merge with same routine in Parser. But where should this 839// live? 840static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 841 const IdentifierInfo *Name) { 842 unsigned N = Name->getLength(); 843 char *SelectorName = new char[3 + N]; 844 memcpy(SelectorName, "set", 3); 845 memcpy(&SelectorName[3], Name->getName(), N); 846 SelectorName[3] = toupper(SelectorName[3]); 847 848 IdentifierInfo *Setter = 849 &Idents.get(SelectorName, &SelectorName[3 + N]); 850 delete[] SelectorName; 851 return Setter; 852} 853 854Action::ExprResult Sema:: 855ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 856 tok::TokenKind OpKind, SourceLocation MemberLoc, 857 IdentifierInfo &Member) { 858 Expr *BaseExpr = static_cast<Expr *>(Base); 859 assert(BaseExpr && "no record expression"); 860 861 // Perform default conversions. 862 DefaultFunctionArrayConversion(BaseExpr); 863 864 QualType BaseType = BaseExpr->getType(); 865 assert(!BaseType.isNull() && "no type for member expression"); 866 867 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 868 // must have pointer type, and the accessed type is the pointee. 869 if (OpKind == tok::arrow) { 870 if (const PointerType *PT = BaseType->getAsPointerType()) 871 BaseType = PT->getPointeeType(); 872 else 873 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow, 874 BaseType.getAsString(), BaseExpr->getSourceRange()); 875 } 876 877 // Handle field access to simple records. This also handles access to fields 878 // of the ObjC 'id' struct. 879 if (const RecordType *RTy = BaseType->getAsRecordType()) { 880 RecordDecl *RDecl = RTy->getDecl(); 881 if (RTy->isIncompleteType()) 882 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 883 BaseExpr->getSourceRange()); 884 // The record definition is complete, now make sure the member is valid. 885 FieldDecl *MemberDecl = RDecl->getMember(&Member); 886 if (!MemberDecl) 887 return Diag(MemberLoc, diag::err_typecheck_no_member, Member.getName(), 888 BaseExpr->getSourceRange()); 889 890 // Figure out the type of the member; see C99 6.5.2.3p3 891 // FIXME: Handle address space modifiers 892 QualType MemberType = MemberDecl->getType(); 893 unsigned combinedQualifiers = 894 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 895 MemberType = MemberType.getQualifiedType(combinedQualifiers); 896 897 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 898 MemberLoc, MemberType); 899 } 900 901 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 902 // (*Obj).ivar. 903 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 904 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 905 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 906 OpKind == tok::arrow); 907 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar, 908 IFTy->getDecl()->getName(), Member.getName(), 909 BaseExpr->getSourceRange()); 910 } 911 912 // Handle Objective-C property access, which is "Obj.property" where Obj is a 913 // pointer to a (potentially qualified) interface type. 914 const PointerType *PTy; 915 const ObjCInterfaceType *IFTy; 916 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 917 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 918 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 919 920 // Search for a declared property first. 921 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 922 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 923 924 // Check protocols on qualified interfaces. 925 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 926 E = IFTy->qual_end(); I != E; ++I) 927 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 928 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 929 930 // If that failed, look for an "implicit" property by seeing if the nullary 931 // selector is implemented. 932 933 // FIXME: The logic for looking up nullary and unary selectors should be 934 // shared with the code in ActOnInstanceMessage. 935 936 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 937 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 938 939 // If this reference is in an @implementation, check for 'private' methods. 940 if (!Getter) 941 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 942 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 943 if (ObjCImplementationDecl *ImpDecl = 944 ObjCImplementations[ClassDecl->getIdentifier()]) 945 Getter = ImpDecl->getInstanceMethod(Sel); 946 947 if (Getter) { 948 // If we found a getter then this may be a valid dot-reference, we 949 // need to also look for the matching setter. 950 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 951 &Member); 952 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 953 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 954 955 if (!Setter) { 956 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 957 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 958 if (ObjCImplementationDecl *ImpDecl = 959 ObjCImplementations[ClassDecl->getIdentifier()]) 960 Setter = ImpDecl->getInstanceMethod(SetterSel); 961 } 962 963 // FIXME: There are some issues here. First, we are not 964 // diagnosing accesses to read-only properties because we do not 965 // know if this is a getter or setter yet. Second, we are 966 // checking that the type of the setter matches the type we 967 // expect. 968 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 969 MemberLoc, BaseExpr); 970 } 971 } 972 973 // Handle 'field access' to vectors, such as 'V.xx'. 974 if (BaseType->isExtVectorType() && OpKind == tok::period) { 975 // Component access limited to variables (reject vec4.rg.g). 976 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 977 !isa<ExtVectorElementExpr>(BaseExpr)) 978 return Diag(MemberLoc, diag::err_ext_vector_component_access, 979 BaseExpr->getSourceRange()); 980 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 981 if (ret.isNull()) 982 return true; 983 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 984 } 985 986 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union, 987 BaseType.getAsString(), BaseExpr->getSourceRange()); 988} 989 990/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 991/// This provides the location of the left/right parens and a list of comma 992/// locations. 993Action::ExprResult Sema:: 994ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 995 ExprTy **args, unsigned NumArgs, 996 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 997 Expr *Fn = static_cast<Expr *>(fn); 998 Expr **Args = reinterpret_cast<Expr**>(args); 999 assert(Fn && "no function call expression"); 1000 FunctionDecl *FDecl = NULL; 1001 1002 // Promote the function operand. 1003 UsualUnaryConversions(Fn); 1004 1005 // If we're directly calling a function, get the declaration for 1006 // that function. 1007 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1008 if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr())) 1009 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1010 1011 // Make the call expr early, before semantic checks. This guarantees cleanup 1012 // of arguments and function on error. 1013 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1014 Context.BoolTy, RParenLoc)); 1015 const FunctionType *FuncT; 1016 if (!Fn->getType()->isBlockPointerType()) { 1017 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1018 // have type pointer to function". 1019 const PointerType *PT = Fn->getType()->getAsPointerType(); 1020 if (PT == 0) 1021 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1022 Fn->getSourceRange()); 1023 FuncT = PT->getPointeeType()->getAsFunctionType(); 1024 } else { // This is a block call. 1025 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1026 getAsFunctionType(); 1027 } 1028 if (FuncT == 0) 1029 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1030 Fn->getSourceRange()); 1031 1032 // We know the result type of the call, set it. 1033 TheCall->setType(FuncT->getResultType()); 1034 1035 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1036 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1037 // assignment, to the types of the corresponding parameter, ... 1038 unsigned NumArgsInProto = Proto->getNumArgs(); 1039 unsigned NumArgsToCheck = NumArgs; 1040 1041 // If too few arguments are available (and we don't have default 1042 // arguments for the remaining parameters), don't make the call. 1043 if (NumArgs < NumArgsInProto) { 1044 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1045 // Use default arguments for missing arguments 1046 NumArgsToCheck = NumArgsInProto; 1047 TheCall->setNumArgs(NumArgsInProto); 1048 } else 1049 return Diag(RParenLoc, 1050 !Fn->getType()->isBlockPointerType() 1051 ? diag::err_typecheck_call_too_few_args 1052 : diag::err_typecheck_block_too_few_args, 1053 Fn->getSourceRange()); 1054 } 1055 1056 // If too many are passed and not variadic, error on the extras and drop 1057 // them. 1058 if (NumArgs > NumArgsInProto) { 1059 if (!Proto->isVariadic()) { 1060 Diag(Args[NumArgsInProto]->getLocStart(), 1061 !Fn->getType()->isBlockPointerType() 1062 ? diag::err_typecheck_call_too_many_args 1063 : diag::err_typecheck_block_too_many_args, 1064 Fn->getSourceRange(), 1065 SourceRange(Args[NumArgsInProto]->getLocStart(), 1066 Args[NumArgs-1]->getLocEnd())); 1067 // This deletes the extra arguments. 1068 TheCall->setNumArgs(NumArgsInProto); 1069 } 1070 NumArgsToCheck = NumArgsInProto; 1071 } 1072 1073 // Continue to check argument types (even if we have too few/many args). 1074 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1075 QualType ProtoArgType = Proto->getArgType(i); 1076 1077 Expr *Arg; 1078 if (i < NumArgs) 1079 Arg = Args[i]; 1080 else 1081 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1082 QualType ArgType = Arg->getType(); 1083 1084 // Compute implicit casts from the operand to the formal argument type. 1085 AssignConvertType ConvTy = 1086 CheckSingleAssignmentConstraints(ProtoArgType, Arg); 1087 TheCall->setArg(i, Arg); 1088 1089 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), ProtoArgType, 1090 ArgType, Arg, "passing")) 1091 return true; 1092 } 1093 1094 // If this is a variadic call, handle args passed through "...". 1095 if (Proto->isVariadic()) { 1096 // Promote the arguments (C99 6.5.2.2p7). 1097 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1098 Expr *Arg = Args[i]; 1099 DefaultArgumentPromotion(Arg); 1100 TheCall->setArg(i, Arg); 1101 } 1102 } 1103 } else { 1104 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1105 1106 // Promote the arguments (C99 6.5.2.2p6). 1107 for (unsigned i = 0; i != NumArgs; i++) { 1108 Expr *Arg = Args[i]; 1109 DefaultArgumentPromotion(Arg); 1110 TheCall->setArg(i, Arg); 1111 } 1112 } 1113 1114 // Do special checking on direct calls to functions. 1115 if (FDecl) 1116 return CheckFunctionCall(FDecl, TheCall.take()); 1117 1118 return TheCall.take(); 1119} 1120 1121Action::ExprResult Sema:: 1122ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1123 SourceLocation RParenLoc, ExprTy *InitExpr) { 1124 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1125 QualType literalType = QualType::getFromOpaquePtr(Ty); 1126 // FIXME: put back this assert when initializers are worked out. 1127 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1128 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1129 1130 if (literalType->isArrayType()) { 1131 if (literalType->isVariableArrayType()) 1132 return Diag(LParenLoc, 1133 diag::err_variable_object_no_init, 1134 SourceRange(LParenLoc, 1135 literalExpr->getSourceRange().getEnd())); 1136 } else if (literalType->isIncompleteType()) { 1137 return Diag(LParenLoc, 1138 diag::err_typecheck_decl_incomplete_type, 1139 literalType.getAsString(), 1140 SourceRange(LParenLoc, 1141 literalExpr->getSourceRange().getEnd())); 1142 } 1143 1144 if (CheckInitializerTypes(literalExpr, literalType)) 1145 return true; 1146 1147 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1148 if (isFileScope) { // 6.5.2.5p3 1149 if (CheckForConstantInitializer(literalExpr, literalType)) 1150 return true; 1151 } 1152 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, isFileScope); 1153} 1154 1155Action::ExprResult Sema:: 1156ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1157 SourceLocation RBraceLoc) { 1158 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1159 1160 // Semantic analysis for initializers is done by ActOnDeclarator() and 1161 // CheckInitializer() - it requires knowledge of the object being intialized. 1162 1163 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc); 1164 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1165 return E; 1166} 1167 1168/// CheckCastTypes - Check type constraints for casting between types. 1169bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1170 UsualUnaryConversions(castExpr); 1171 1172 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1173 // type needs to be scalar. 1174 if (castType->isVoidType()) { 1175 // Cast to void allows any expr type. 1176 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1177 // GCC struct/union extension: allow cast to self. 1178 if (Context.getCanonicalType(castType) != 1179 Context.getCanonicalType(castExpr->getType()) || 1180 (!castType->isStructureType() && !castType->isUnionType())) { 1181 // Reject any other conversions to non-scalar types. 1182 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar, 1183 castType.getAsString(), castExpr->getSourceRange()); 1184 } 1185 1186 // accept this, but emit an ext-warn. 1187 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar, 1188 castType.getAsString(), castExpr->getSourceRange()); 1189 } else if (!castExpr->getType()->isScalarType() && 1190 !castExpr->getType()->isVectorType()) { 1191 return Diag(castExpr->getLocStart(), 1192 diag::err_typecheck_expect_scalar_operand, 1193 castExpr->getType().getAsString(),castExpr->getSourceRange()); 1194 } else if (castExpr->getType()->isVectorType()) { 1195 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1196 return true; 1197 } else if (castType->isVectorType()) { 1198 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1199 return true; 1200 } 1201 return false; 1202} 1203 1204bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1205 assert(VectorTy->isVectorType() && "Not a vector type!"); 1206 1207 if (Ty->isVectorType() || Ty->isIntegerType()) { 1208 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1209 return Diag(R.getBegin(), 1210 Ty->isVectorType() ? 1211 diag::err_invalid_conversion_between_vectors : 1212 diag::err_invalid_conversion_between_vector_and_integer, 1213 VectorTy.getAsString().c_str(), 1214 Ty.getAsString().c_str(), R); 1215 } else 1216 return Diag(R.getBegin(), 1217 diag::err_invalid_conversion_between_vector_and_scalar, 1218 VectorTy.getAsString().c_str(), 1219 Ty.getAsString().c_str(), R); 1220 1221 return false; 1222} 1223 1224Action::ExprResult Sema:: 1225ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1226 SourceLocation RParenLoc, ExprTy *Op) { 1227 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1228 1229 Expr *castExpr = static_cast<Expr*>(Op); 1230 QualType castType = QualType::getFromOpaquePtr(Ty); 1231 1232 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1233 return true; 1234 return new ExplicitCastExpr(castType, castExpr, LParenLoc); 1235} 1236 1237/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1238/// In that case, lex = cond. 1239inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1240 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1241 UsualUnaryConversions(cond); 1242 UsualUnaryConversions(lex); 1243 UsualUnaryConversions(rex); 1244 QualType condT = cond->getType(); 1245 QualType lexT = lex->getType(); 1246 QualType rexT = rex->getType(); 1247 1248 // first, check the condition. 1249 if (!condT->isScalarType()) { // C99 6.5.15p2 1250 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1251 condT.getAsString()); 1252 return QualType(); 1253 } 1254 1255 // Now check the two expressions. 1256 1257 // If both operands have arithmetic type, do the usual arithmetic conversions 1258 // to find a common type: C99 6.5.15p3,5. 1259 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1260 UsualArithmeticConversions(lex, rex); 1261 return lex->getType(); 1262 } 1263 1264 // If both operands are the same structure or union type, the result is that 1265 // type. 1266 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1267 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1268 if (LHSRT->getDecl() == RHSRT->getDecl()) 1269 // "If both the operands have structure or union type, the result has 1270 // that type." This implies that CV qualifiers are dropped. 1271 return lexT.getUnqualifiedType(); 1272 } 1273 1274 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1275 // The following || allows only one side to be void (a GCC-ism). 1276 if (lexT->isVoidType() || rexT->isVoidType()) { 1277 if (!lexT->isVoidType()) 1278 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1279 rex->getSourceRange()); 1280 if (!rexT->isVoidType()) 1281 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1282 lex->getSourceRange()); 1283 ImpCastExprToType(lex, Context.VoidTy); 1284 ImpCastExprToType(rex, Context.VoidTy); 1285 return Context.VoidTy; 1286 } 1287 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1288 // the type of the other operand." 1289 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1290 Context.isObjCObjectPointerType(lexT)) && 1291 rex->isNullPointerConstant(Context)) { 1292 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1293 return lexT; 1294 } 1295 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1296 Context.isObjCObjectPointerType(rexT)) && 1297 lex->isNullPointerConstant(Context)) { 1298 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1299 return rexT; 1300 } 1301 // Handle the case where both operands are pointers before we handle null 1302 // pointer constants in case both operands are null pointer constants. 1303 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1304 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1305 // get the "pointed to" types 1306 QualType lhptee = LHSPT->getPointeeType(); 1307 QualType rhptee = RHSPT->getPointeeType(); 1308 1309 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1310 if (lhptee->isVoidType() && 1311 rhptee->isIncompleteOrObjectType()) { 1312 // Figure out necessary qualifiers (C99 6.5.15p6) 1313 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1314 QualType destType = Context.getPointerType(destPointee); 1315 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1316 ImpCastExprToType(rex, destType); // promote to void* 1317 return destType; 1318 } 1319 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1320 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1321 QualType destType = Context.getPointerType(destPointee); 1322 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1323 ImpCastExprToType(rex, destType); // promote to void* 1324 return destType; 1325 } 1326 1327 QualType compositeType = lexT; 1328 1329 // If either type is an Objective-C object type then check 1330 // compatibility according to Objective-C. 1331 if (Context.isObjCObjectPointerType(lexT) || 1332 Context.isObjCObjectPointerType(rexT)) { 1333 // If both operands are interfaces and either operand can be 1334 // assigned to the other, use that type as the composite 1335 // type. This allows 1336 // xxx ? (A*) a : (B*) b 1337 // where B is a subclass of A. 1338 // 1339 // Additionally, as for assignment, if either type is 'id' 1340 // allow silent coercion. Finally, if the types are 1341 // incompatible then make sure to use 'id' as the composite 1342 // type so the result is acceptable for sending messages to. 1343 1344 // FIXME: This code should not be localized to here. Also this 1345 // should use a compatible check instead of abusing the 1346 // canAssignObjCInterfaces code. 1347 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1348 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1349 if (LHSIface && RHSIface && 1350 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1351 compositeType = lexT; 1352 } else if (LHSIface && RHSIface && 1353 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1354 compositeType = rexT; 1355 } else if (Context.isObjCIdType(lhptee) || 1356 Context.isObjCIdType(rhptee)) { 1357 // FIXME: This code looks wrong, because isObjCIdType checks 1358 // the struct but getObjCIdType returns the pointer to 1359 // struct. This is horrible and should be fixed. 1360 compositeType = Context.getObjCIdType(); 1361 } else { 1362 QualType incompatTy = Context.getObjCIdType(); 1363 ImpCastExprToType(lex, incompatTy); 1364 ImpCastExprToType(rex, incompatTy); 1365 return incompatTy; 1366 } 1367 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1368 rhptee.getUnqualifiedType())) { 1369 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 1370 lexT.getAsString(), rexT.getAsString(), 1371 lex->getSourceRange(), rex->getSourceRange()); 1372 // In this situation, we assume void* type. No especially good 1373 // reason, but this is what gcc does, and we do have to pick 1374 // to get a consistent AST. 1375 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1376 ImpCastExprToType(lex, incompatTy); 1377 ImpCastExprToType(rex, incompatTy); 1378 return incompatTy; 1379 } 1380 // The pointer types are compatible. 1381 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1382 // differently qualified versions of compatible types, the result type is 1383 // a pointer to an appropriately qualified version of the *composite* 1384 // type. 1385 // FIXME: Need to calculate the composite type. 1386 // FIXME: Need to add qualifiers 1387 ImpCastExprToType(lex, compositeType); 1388 ImpCastExprToType(rex, compositeType); 1389 return compositeType; 1390 } 1391 } 1392 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1393 // evaluates to "struct objc_object *" (and is handled above when comparing 1394 // id with statically typed objects). 1395 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1396 // GCC allows qualified id and any Objective-C type to devolve to 1397 // id. Currently localizing to here until clear this should be 1398 // part of ObjCQualifiedIdTypesAreCompatible. 1399 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1400 (lexT->isObjCQualifiedIdType() && 1401 Context.isObjCObjectPointerType(rexT)) || 1402 (rexT->isObjCQualifiedIdType() && 1403 Context.isObjCObjectPointerType(lexT))) { 1404 // FIXME: This is not the correct composite type. This only 1405 // happens to work because id can more or less be used anywhere, 1406 // however this may change the type of method sends. 1407 // FIXME: gcc adds some type-checking of the arguments and emits 1408 // (confusing) incompatible comparison warnings in some 1409 // cases. Investigate. 1410 QualType compositeType = Context.getObjCIdType(); 1411 ImpCastExprToType(lex, compositeType); 1412 ImpCastExprToType(rex, compositeType); 1413 return compositeType; 1414 } 1415 } 1416 1417 // Selection between block pointer types is ok as long as they are the same. 1418 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1419 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1420 return lexT; 1421 1422 // Otherwise, the operands are not compatible. 1423 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 1424 lexT.getAsString(), rexT.getAsString(), 1425 lex->getSourceRange(), rex->getSourceRange()); 1426 return QualType(); 1427} 1428 1429/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1430/// in the case of a the GNU conditional expr extension. 1431Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1432 SourceLocation ColonLoc, 1433 ExprTy *Cond, ExprTy *LHS, 1434 ExprTy *RHS) { 1435 Expr *CondExpr = (Expr *) Cond; 1436 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1437 1438 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1439 // was the condition. 1440 bool isLHSNull = LHSExpr == 0; 1441 if (isLHSNull) 1442 LHSExpr = CondExpr; 1443 1444 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1445 RHSExpr, QuestionLoc); 1446 if (result.isNull()) 1447 return true; 1448 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1449 RHSExpr, result); 1450} 1451 1452 1453// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1454// being closely modeled after the C99 spec:-). The odd characteristic of this 1455// routine is it effectively iqnores the qualifiers on the top level pointee. 1456// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1457// FIXME: add a couple examples in this comment. 1458Sema::AssignConvertType 1459Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1460 QualType lhptee, rhptee; 1461 1462 // get the "pointed to" type (ignoring qualifiers at the top level) 1463 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1464 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1465 1466 // make sure we operate on the canonical type 1467 lhptee = Context.getCanonicalType(lhptee); 1468 rhptee = Context.getCanonicalType(rhptee); 1469 1470 AssignConvertType ConvTy = Compatible; 1471 1472 // C99 6.5.16.1p1: This following citation is common to constraints 1473 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1474 // qualifiers of the type *pointed to* by the right; 1475 // FIXME: Handle ASQualType 1476 if ((lhptee.getCVRQualifiers() & rhptee.getCVRQualifiers()) != 1477 rhptee.getCVRQualifiers()) 1478 ConvTy = CompatiblePointerDiscardsQualifiers; 1479 1480 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1481 // incomplete type and the other is a pointer to a qualified or unqualified 1482 // version of void... 1483 if (lhptee->isVoidType()) { 1484 if (rhptee->isIncompleteOrObjectType()) 1485 return ConvTy; 1486 1487 // As an extension, we allow cast to/from void* to function pointer. 1488 assert(rhptee->isFunctionType()); 1489 return FunctionVoidPointer; 1490 } 1491 1492 if (rhptee->isVoidType()) { 1493 if (lhptee->isIncompleteOrObjectType()) 1494 return ConvTy; 1495 1496 // As an extension, we allow cast to/from void* to function pointer. 1497 assert(lhptee->isFunctionType()); 1498 return FunctionVoidPointer; 1499 } 1500 1501 // Check for ObjC interfaces 1502 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1503 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1504 if (LHSIface && RHSIface && 1505 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1506 return ConvTy; 1507 1508 // ID acts sort of like void* for ObjC interfaces 1509 if (LHSIface && Context.isObjCIdType(rhptee)) 1510 return ConvTy; 1511 if (RHSIface && Context.isObjCIdType(lhptee)) 1512 return ConvTy; 1513 1514 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1515 // unqualified versions of compatible types, ... 1516 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1517 rhptee.getUnqualifiedType())) 1518 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1519 return ConvTy; 1520} 1521 1522/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1523/// block pointer types are compatible or whether a block and normal pointer 1524/// are compatible. It is more restrict than comparing two function pointer 1525// types. 1526Sema::AssignConvertType 1527Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1528 QualType rhsType) { 1529 QualType lhptee, rhptee; 1530 1531 // get the "pointed to" type (ignoring qualifiers at the top level) 1532 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1533 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1534 1535 // make sure we operate on the canonical type 1536 lhptee = Context.getCanonicalType(lhptee); 1537 rhptee = Context.getCanonicalType(rhptee); 1538 1539 AssignConvertType ConvTy = Compatible; 1540 1541 // For blocks we enforce that qualifiers are identical. 1542 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1543 ConvTy = CompatiblePointerDiscardsQualifiers; 1544 1545 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1546 return IncompatibleBlockPointer; 1547 return ConvTy; 1548} 1549 1550/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1551/// has code to accommodate several GCC extensions when type checking 1552/// pointers. Here are some objectionable examples that GCC considers warnings: 1553/// 1554/// int a, *pint; 1555/// short *pshort; 1556/// struct foo *pfoo; 1557/// 1558/// pint = pshort; // warning: assignment from incompatible pointer type 1559/// a = pint; // warning: assignment makes integer from pointer without a cast 1560/// pint = a; // warning: assignment makes pointer from integer without a cast 1561/// pint = pfoo; // warning: assignment from incompatible pointer type 1562/// 1563/// As a result, the code for dealing with pointers is more complex than the 1564/// C99 spec dictates. 1565/// 1566Sema::AssignConvertType 1567Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1568 // Get canonical types. We're not formatting these types, just comparing 1569 // them. 1570 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1571 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1572 1573 if (lhsType == rhsType) 1574 return Compatible; // Common case: fast path an exact match. 1575 1576 if (lhsType->isReferenceType() || rhsType->isReferenceType()) { 1577 if (Context.typesAreCompatible(lhsType, rhsType)) 1578 return Compatible; 1579 return Incompatible; 1580 } 1581 1582 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1583 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1584 return Compatible; 1585 // Relax integer conversions like we do for pointers below. 1586 if (rhsType->isIntegerType()) 1587 return IntToPointer; 1588 if (lhsType->isIntegerType()) 1589 return PointerToInt; 1590 return Incompatible; 1591 } 1592 1593 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1594 // For ExtVector, allow vector splats; float -> <n x float> 1595 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1596 if (LV->getElementType() == rhsType) 1597 return Compatible; 1598 1599 // If we are allowing lax vector conversions, and LHS and RHS are both 1600 // vectors, the total size only needs to be the same. This is a bitcast; 1601 // no bits are changed but the result type is different. 1602 if (getLangOptions().LaxVectorConversions && 1603 lhsType->isVectorType() && rhsType->isVectorType()) { 1604 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1605 return Compatible; 1606 } 1607 return Incompatible; 1608 } 1609 1610 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1611 return Compatible; 1612 1613 if (isa<PointerType>(lhsType)) { 1614 if (rhsType->isIntegerType()) 1615 return IntToPointer; 1616 1617 if (isa<PointerType>(rhsType)) 1618 return CheckPointerTypesForAssignment(lhsType, rhsType); 1619 1620 if (rhsType->getAsBlockPointerType()) { 1621 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1622 return BlockVoidPointer; 1623 1624 // Treat block pointers as objects. 1625 if (getLangOptions().ObjC1 && 1626 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 1627 return Compatible; 1628 } 1629 return Incompatible; 1630 } 1631 1632 if (isa<BlockPointerType>(lhsType)) { 1633 if (rhsType->isIntegerType()) 1634 return IntToPointer; 1635 1636 // Treat block pointers as objects. 1637 if (getLangOptions().ObjC1 && 1638 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 1639 return Compatible; 1640 1641 if (rhsType->isBlockPointerType()) 1642 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1643 1644 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1645 if (RHSPT->getPointeeType()->isVoidType()) 1646 return BlockVoidPointer; 1647 } 1648 return Incompatible; 1649 } 1650 1651 if (isa<PointerType>(rhsType)) { 1652 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1653 if (lhsType == Context.BoolTy) 1654 return Compatible; 1655 1656 if (lhsType->isIntegerType()) 1657 return PointerToInt; 1658 1659 if (isa<PointerType>(lhsType)) 1660 return CheckPointerTypesForAssignment(lhsType, rhsType); 1661 1662 if (isa<BlockPointerType>(lhsType) && 1663 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1664 return BlockVoidPointer; 1665 return Incompatible; 1666 } 1667 1668 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1669 if (Context.typesAreCompatible(lhsType, rhsType)) 1670 return Compatible; 1671 } 1672 return Incompatible; 1673} 1674 1675Sema::AssignConvertType 1676Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1677 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1678 // a null pointer constant. 1679 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 1680 lhsType->isBlockPointerType()) 1681 && rExpr->isNullPointerConstant(Context)) { 1682 ImpCastExprToType(rExpr, lhsType); 1683 return Compatible; 1684 } 1685 1686 // We don't allow conversion of non-null-pointer constants to integers. 1687 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 1688 return IntToBlockPointer; 1689 1690 // This check seems unnatural, however it is necessary to ensure the proper 1691 // conversion of functions/arrays. If the conversion were done for all 1692 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1693 // expressions that surpress this implicit conversion (&, sizeof). 1694 // 1695 // Suppress this for references: C99 8.5.3p5. FIXME: revisit when references 1696 // are better understood. 1697 if (!lhsType->isReferenceType()) 1698 DefaultFunctionArrayConversion(rExpr); 1699 1700 Sema::AssignConvertType result = 1701 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1702 1703 // C99 6.5.16.1p2: The value of the right operand is converted to the 1704 // type of the assignment expression. 1705 if (rExpr->getType() != lhsType) 1706 ImpCastExprToType(rExpr, lhsType); 1707 return result; 1708} 1709 1710Sema::AssignConvertType 1711Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1712 return CheckAssignmentConstraints(lhsType, rhsType); 1713} 1714 1715QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1716 Diag(loc, diag::err_typecheck_invalid_operands, 1717 lex->getType().getAsString(), rex->getType().getAsString(), 1718 lex->getSourceRange(), rex->getSourceRange()); 1719 return QualType(); 1720} 1721 1722inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1723 Expr *&rex) { 1724 // For conversion purposes, we ignore any qualifiers. 1725 // For example, "const float" and "float" are equivalent. 1726 QualType lhsType = 1727 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1728 QualType rhsType = 1729 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1730 1731 // If the vector types are identical, return. 1732 if (lhsType == rhsType) 1733 return lhsType; 1734 1735 // Handle the case of a vector & extvector type of the same size and element 1736 // type. It would be nice if we only had one vector type someday. 1737 if (getLangOptions().LaxVectorConversions) 1738 if (const VectorType *LV = lhsType->getAsVectorType()) 1739 if (const VectorType *RV = rhsType->getAsVectorType()) 1740 if (LV->getElementType() == RV->getElementType() && 1741 LV->getNumElements() == RV->getNumElements()) 1742 return lhsType->isExtVectorType() ? lhsType : rhsType; 1743 1744 // If the lhs is an extended vector and the rhs is a scalar of the same type 1745 // or a literal, promote the rhs to the vector type. 1746 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1747 QualType eltType = V->getElementType(); 1748 1749 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1750 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1751 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1752 ImpCastExprToType(rex, lhsType); 1753 return lhsType; 1754 } 1755 } 1756 1757 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1758 // promote the lhs to the vector type. 1759 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1760 QualType eltType = V->getElementType(); 1761 1762 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1763 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1764 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1765 ImpCastExprToType(lex, rhsType); 1766 return rhsType; 1767 } 1768 } 1769 1770 // You cannot convert between vector values of different size. 1771 Diag(loc, diag::err_typecheck_vector_not_convertable, 1772 lex->getType().getAsString(), rex->getType().getAsString(), 1773 lex->getSourceRange(), rex->getSourceRange()); 1774 return QualType(); 1775} 1776 1777inline QualType Sema::CheckMultiplyDivideOperands( 1778 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1779{ 1780 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1781 1782 if (lhsType->isVectorType() || rhsType->isVectorType()) 1783 return CheckVectorOperands(loc, lex, rex); 1784 1785 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1786 1787 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1788 return compType; 1789 return InvalidOperands(loc, lex, rex); 1790} 1791 1792inline QualType Sema::CheckRemainderOperands( 1793 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1794{ 1795 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1796 1797 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1798 1799 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1800 return compType; 1801 return InvalidOperands(loc, lex, rex); 1802} 1803 1804inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1805 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1806{ 1807 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1808 return CheckVectorOperands(loc, lex, rex); 1809 1810 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1811 1812 // handle the common case first (both operands are arithmetic). 1813 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1814 return compType; 1815 1816 // Put any potential pointer into PExp 1817 Expr* PExp = lex, *IExp = rex; 1818 if (IExp->getType()->isPointerType()) 1819 std::swap(PExp, IExp); 1820 1821 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1822 if (IExp->getType()->isIntegerType()) { 1823 // Check for arithmetic on pointers to incomplete types 1824 if (!PTy->getPointeeType()->isObjectType()) { 1825 if (PTy->getPointeeType()->isVoidType()) { 1826 Diag(loc, diag::ext_gnu_void_ptr, 1827 lex->getSourceRange(), rex->getSourceRange()); 1828 } else { 1829 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1830 lex->getType().getAsString(), lex->getSourceRange()); 1831 return QualType(); 1832 } 1833 } 1834 return PExp->getType(); 1835 } 1836 } 1837 1838 return InvalidOperands(loc, lex, rex); 1839} 1840 1841// C99 6.5.6 1842QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1843 SourceLocation loc, bool isCompAssign) { 1844 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1845 return CheckVectorOperands(loc, lex, rex); 1846 1847 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1848 1849 // Enforce type constraints: C99 6.5.6p3. 1850 1851 // Handle the common case first (both operands are arithmetic). 1852 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1853 return compType; 1854 1855 // Either ptr - int or ptr - ptr. 1856 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1857 QualType lpointee = LHSPTy->getPointeeType(); 1858 1859 // The LHS must be an object type, not incomplete, function, etc. 1860 if (!lpointee->isObjectType()) { 1861 // Handle the GNU void* extension. 1862 if (lpointee->isVoidType()) { 1863 Diag(loc, diag::ext_gnu_void_ptr, 1864 lex->getSourceRange(), rex->getSourceRange()); 1865 } else { 1866 Diag(loc, diag::err_typecheck_sub_ptr_object, 1867 lex->getType().getAsString(), lex->getSourceRange()); 1868 return QualType(); 1869 } 1870 } 1871 1872 // The result type of a pointer-int computation is the pointer type. 1873 if (rex->getType()->isIntegerType()) 1874 return lex->getType(); 1875 1876 // Handle pointer-pointer subtractions. 1877 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1878 QualType rpointee = RHSPTy->getPointeeType(); 1879 1880 // RHS must be an object type, unless void (GNU). 1881 if (!rpointee->isObjectType()) { 1882 // Handle the GNU void* extension. 1883 if (rpointee->isVoidType()) { 1884 if (!lpointee->isVoidType()) 1885 Diag(loc, diag::ext_gnu_void_ptr, 1886 lex->getSourceRange(), rex->getSourceRange()); 1887 } else { 1888 Diag(loc, diag::err_typecheck_sub_ptr_object, 1889 rex->getType().getAsString(), rex->getSourceRange()); 1890 return QualType(); 1891 } 1892 } 1893 1894 // Pointee types must be compatible. 1895 if (!Context.typesAreCompatible( 1896 Context.getCanonicalType(lpointee).getUnqualifiedType(), 1897 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 1898 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 1899 lex->getType().getAsString(), rex->getType().getAsString(), 1900 lex->getSourceRange(), rex->getSourceRange()); 1901 return QualType(); 1902 } 1903 1904 return Context.getPointerDiffType(); 1905 } 1906 } 1907 1908 return InvalidOperands(loc, lex, rex); 1909} 1910 1911// C99 6.5.7 1912QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1913 bool isCompAssign) { 1914 // C99 6.5.7p2: Each of the operands shall have integer type. 1915 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 1916 return InvalidOperands(loc, lex, rex); 1917 1918 // Shifts don't perform usual arithmetic conversions, they just do integer 1919 // promotions on each operand. C99 6.5.7p3 1920 if (!isCompAssign) 1921 UsualUnaryConversions(lex); 1922 UsualUnaryConversions(rex); 1923 1924 // "The type of the result is that of the promoted left operand." 1925 return lex->getType(); 1926} 1927 1928static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 1929 ASTContext& Context) { 1930 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 1931 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 1932 // ID acts sort of like void* for ObjC interfaces 1933 if (LHSIface && Context.isObjCIdType(RHS)) 1934 return true; 1935 if (RHSIface && Context.isObjCIdType(LHS)) 1936 return true; 1937 if (!LHSIface || !RHSIface) 1938 return false; 1939 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 1940 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 1941} 1942 1943// C99 6.5.8 1944QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1945 bool isRelational) { 1946 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1947 return CheckVectorCompareOperands(lex, rex, loc, isRelational); 1948 1949 // C99 6.5.8p3 / C99 6.5.9p4 1950 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1951 UsualArithmeticConversions(lex, rex); 1952 else { 1953 UsualUnaryConversions(lex); 1954 UsualUnaryConversions(rex); 1955 } 1956 QualType lType = lex->getType(); 1957 QualType rType = rex->getType(); 1958 1959 // For non-floating point types, check for self-comparisons of the form 1960 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 1961 // often indicate logic errors in the program. 1962 if (!lType->isFloatingType()) { 1963 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 1964 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 1965 if (DRL->getDecl() == DRR->getDecl()) 1966 Diag(loc, diag::warn_selfcomparison); 1967 } 1968 1969 if (isRelational) { 1970 if (lType->isRealType() && rType->isRealType()) 1971 return Context.IntTy; 1972 } else { 1973 // Check for comparisons of floating point operands using != and ==. 1974 if (lType->isFloatingType()) { 1975 assert (rType->isFloatingType()); 1976 CheckFloatComparison(loc,lex,rex); 1977 } 1978 1979 if (lType->isArithmeticType() && rType->isArithmeticType()) 1980 return Context.IntTy; 1981 } 1982 1983 bool LHSIsNull = lex->isNullPointerConstant(Context); 1984 bool RHSIsNull = rex->isNullPointerConstant(Context); 1985 1986 // All of the following pointer related warnings are GCC extensions, except 1987 // when handling null pointer constants. One day, we can consider making them 1988 // errors (when -pedantic-errors is enabled). 1989 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 1990 QualType LCanPointeeTy = 1991 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 1992 QualType RCanPointeeTy = 1993 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 1994 1995 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 1996 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 1997 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 1998 RCanPointeeTy.getUnqualifiedType()) && 1999 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2000 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2001 lType.getAsString(), rType.getAsString(), 2002 lex->getSourceRange(), rex->getSourceRange()); 2003 } 2004 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2005 return Context.IntTy; 2006 } 2007 // Handle block pointer types. 2008 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2009 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2010 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2011 2012 if (!LHSIsNull && !RHSIsNull && 2013 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2014 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2015 lType.getAsString(), rType.getAsString(), 2016 lex->getSourceRange(), rex->getSourceRange()); 2017 } 2018 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2019 return Context.IntTy; 2020 } 2021 // Allow block pointers to be compared with null pointer constants. 2022 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2023 (lType->isPointerType() && rType->isBlockPointerType())) { 2024 if (!LHSIsNull && !RHSIsNull) { 2025 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2026 lType.getAsString(), rType.getAsString(), 2027 lex->getSourceRange(), rex->getSourceRange()); 2028 } 2029 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2030 return Context.IntTy; 2031 } 2032 2033 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2034 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2035 ImpCastExprToType(rex, lType); 2036 return Context.IntTy; 2037 } 2038 } 2039 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2040 rType->isIntegerType()) { 2041 if (!RHSIsNull) 2042 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2043 lType.getAsString(), rType.getAsString(), 2044 lex->getSourceRange(), rex->getSourceRange()); 2045 ImpCastExprToType(rex, lType); // promote the integer to pointer 2046 return Context.IntTy; 2047 } 2048 if (lType->isIntegerType() && 2049 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2050 if (!LHSIsNull) 2051 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2052 lType.getAsString(), rType.getAsString(), 2053 lex->getSourceRange(), rex->getSourceRange()); 2054 ImpCastExprToType(lex, rType); // promote the integer to pointer 2055 return Context.IntTy; 2056 } 2057 // Handle block pointers. 2058 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2059 if (!RHSIsNull) 2060 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2061 lType.getAsString(), rType.getAsString(), 2062 lex->getSourceRange(), rex->getSourceRange()); 2063 ImpCastExprToType(rex, lType); // promote the integer to pointer 2064 return Context.IntTy; 2065 } 2066 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2067 if (!LHSIsNull) 2068 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2069 lType.getAsString(), rType.getAsString(), 2070 lex->getSourceRange(), rex->getSourceRange()); 2071 ImpCastExprToType(lex, rType); // promote the integer to pointer 2072 return Context.IntTy; 2073 } 2074 return InvalidOperands(loc, lex, rex); 2075} 2076 2077/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2078/// operates on extended vector types. Instead of producing an IntTy result, 2079/// like a scalar comparison, a vector comparison produces a vector of integer 2080/// types. 2081QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2082 SourceLocation loc, 2083 bool isRelational) { 2084 // Check to make sure we're operating on vectors of the same type and width, 2085 // Allowing one side to be a scalar of element type. 2086 QualType vType = CheckVectorOperands(loc, lex, rex); 2087 if (vType.isNull()) 2088 return vType; 2089 2090 QualType lType = lex->getType(); 2091 QualType rType = rex->getType(); 2092 2093 // For non-floating point types, check for self-comparisons of the form 2094 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2095 // often indicate logic errors in the program. 2096 if (!lType->isFloatingType()) { 2097 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2098 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2099 if (DRL->getDecl() == DRR->getDecl()) 2100 Diag(loc, diag::warn_selfcomparison); 2101 } 2102 2103 // Check for comparisons of floating point operands using != and ==. 2104 if (!isRelational && lType->isFloatingType()) { 2105 assert (rType->isFloatingType()); 2106 CheckFloatComparison(loc,lex,rex); 2107 } 2108 2109 // Return the type for the comparison, which is the same as vector type for 2110 // integer vectors, or an integer type of identical size and number of 2111 // elements for floating point vectors. 2112 if (lType->isIntegerType()) 2113 return lType; 2114 2115 const VectorType *VTy = lType->getAsVectorType(); 2116 2117 // FIXME: need to deal with non-32b int / non-64b long long 2118 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2119 if (TypeSize == 32) { 2120 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2121 } 2122 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2123 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2124} 2125 2126inline QualType Sema::CheckBitwiseOperands( 2127 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 2128{ 2129 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2130 return CheckVectorOperands(loc, lex, rex); 2131 2132 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2133 2134 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2135 return compType; 2136 return InvalidOperands(loc, lex, rex); 2137} 2138 2139inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2140 Expr *&lex, Expr *&rex, SourceLocation loc) 2141{ 2142 UsualUnaryConversions(lex); 2143 UsualUnaryConversions(rex); 2144 2145 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2146 return Context.IntTy; 2147 return InvalidOperands(loc, lex, rex); 2148} 2149 2150inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 2151 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 2152{ 2153 QualType lhsType = lex->getType(); 2154 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 2155 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(Context); 2156 2157 switch (mlval) { // C99 6.5.16p2 2158 case Expr::MLV_Valid: 2159 break; 2160 case Expr::MLV_ConstQualified: 2161 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 2162 return QualType(); 2163 case Expr::MLV_ArrayType: 2164 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 2165 lhsType.getAsString(), lex->getSourceRange()); 2166 return QualType(); 2167 case Expr::MLV_NotObjectType: 2168 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 2169 lhsType.getAsString(), lex->getSourceRange()); 2170 return QualType(); 2171 case Expr::MLV_InvalidExpression: 2172 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 2173 lex->getSourceRange()); 2174 return QualType(); 2175 case Expr::MLV_IncompleteType: 2176 case Expr::MLV_IncompleteVoidType: 2177 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 2178 lhsType.getAsString(), lex->getSourceRange()); 2179 return QualType(); 2180 case Expr::MLV_DuplicateVectorComponents: 2181 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 2182 lex->getSourceRange()); 2183 return QualType(); 2184 case Expr::MLV_NotBlockQualified: 2185 Diag(loc, diag::err_block_decl_ref_not_modifiable_lvalue, 2186 lex->getSourceRange()); 2187 return QualType(); 2188 } 2189 2190 AssignConvertType ConvTy; 2191 if (compoundType.isNull()) { 2192 // Simple assignment "x = y". 2193 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 2194 2195 // If the RHS is a unary plus or minus, check to see if they = and + are 2196 // right next to each other. If so, the user may have typo'd "x =+ 4" 2197 // instead of "x += 4". 2198 Expr *RHSCheck = rex; 2199 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2200 RHSCheck = ICE->getSubExpr(); 2201 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2202 if ((UO->getOpcode() == UnaryOperator::Plus || 2203 UO->getOpcode() == UnaryOperator::Minus) && 2204 loc.isFileID() && UO->getOperatorLoc().isFileID() && 2205 // Only if the two operators are exactly adjacent. 2206 loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2207 Diag(loc, diag::warn_not_compound_assign, 2208 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2209 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2210 } 2211 } else { 2212 // Compound assignment "x += y" 2213 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 2214 } 2215 2216 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 2217 rex, "assigning")) 2218 return QualType(); 2219 2220 // C99 6.5.16p3: The type of an assignment expression is the type of the 2221 // left operand unless the left operand has qualified type, in which case 2222 // it is the unqualified version of the type of the left operand. 2223 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2224 // is converted to the type of the assignment expression (above). 2225 // C++ 5.17p1: the type of the assignment expression is that of its left 2226 // oprdu. 2227 return lhsType.getUnqualifiedType(); 2228} 2229 2230inline QualType Sema::CheckCommaOperands( // C99 6.5.17 2231 Expr *&lex, Expr *&rex, SourceLocation loc) { 2232 2233 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2234 DefaultFunctionArrayConversion(rex); 2235 return rex->getType(); 2236} 2237 2238/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2239/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2240QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2241 QualType resType = op->getType(); 2242 assert(!resType.isNull() && "no type for increment/decrement expression"); 2243 2244 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2245 if (const PointerType *pt = resType->getAsPointerType()) { 2246 if (pt->getPointeeType()->isVoidType()) { 2247 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2248 } else if (!pt->getPointeeType()->isObjectType()) { 2249 // C99 6.5.2.4p2, 6.5.6p2 2250 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2251 resType.getAsString(), op->getSourceRange()); 2252 return QualType(); 2253 } 2254 } else if (!resType->isRealType()) { 2255 if (resType->isComplexType()) 2256 // C99 does not support ++/-- on complex types. 2257 Diag(OpLoc, diag::ext_integer_increment_complex, 2258 resType.getAsString(), op->getSourceRange()); 2259 else { 2260 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2261 resType.getAsString(), op->getSourceRange()); 2262 return QualType(); 2263 } 2264 } 2265 // At this point, we know we have a real, complex or pointer type. 2266 // Now make sure the operand is a modifiable lvalue. 2267 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(Context); 2268 if (mlval != Expr::MLV_Valid) { 2269 // FIXME: emit a more precise diagnostic... 2270 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 2271 op->getSourceRange()); 2272 return QualType(); 2273 } 2274 return resType; 2275} 2276 2277/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2278/// This routine allows us to typecheck complex/recursive expressions 2279/// where the declaration is needed for type checking. We only need to 2280/// handle cases when the expression references a function designator 2281/// or is an lvalue. Here are some examples: 2282/// - &(x) => x 2283/// - &*****f => f for f a function designator. 2284/// - &s.xx => s 2285/// - &s.zz[1].yy -> s, if zz is an array 2286/// - *(x + 1) -> x, if x is an array 2287/// - &"123"[2] -> 0 2288/// - & __real__ x -> x 2289static ValueDecl *getPrimaryDecl(Expr *E) { 2290 switch (E->getStmtClass()) { 2291 case Stmt::DeclRefExprClass: 2292 return cast<DeclRefExpr>(E)->getDecl(); 2293 case Stmt::MemberExprClass: 2294 // Fields cannot be declared with a 'register' storage class. 2295 // &X->f is always ok, even if X is declared register. 2296 if (cast<MemberExpr>(E)->isArrow()) 2297 return 0; 2298 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2299 case Stmt::ArraySubscriptExprClass: { 2300 // &X[4] and &4[X] refers to X if X is not a pointer. 2301 2302 ValueDecl *VD = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2303 if (!VD || VD->getType()->isPointerType()) 2304 return 0; 2305 else 2306 return VD; 2307 } 2308 case Stmt::UnaryOperatorClass: { 2309 UnaryOperator *UO = cast<UnaryOperator>(E); 2310 2311 switch(UO->getOpcode()) { 2312 case UnaryOperator::Deref: { 2313 // *(X + 1) refers to X if X is not a pointer. 2314 ValueDecl *VD = getPrimaryDecl(UO->getSubExpr()); 2315 if (!VD || VD->getType()->isPointerType()) 2316 return 0; 2317 return VD; 2318 } 2319 case UnaryOperator::Real: 2320 case UnaryOperator::Imag: 2321 case UnaryOperator::Extension: 2322 return getPrimaryDecl(UO->getSubExpr()); 2323 default: 2324 return 0; 2325 } 2326 } 2327 case Stmt::BinaryOperatorClass: { 2328 BinaryOperator *BO = cast<BinaryOperator>(E); 2329 2330 // Handle cases involving pointer arithmetic. The result of an 2331 // Assign or AddAssign is not an lvalue so they can be ignored. 2332 2333 // (x + n) or (n + x) => x 2334 if (BO->getOpcode() == BinaryOperator::Add) { 2335 if (BO->getLHS()->getType()->isPointerType()) { 2336 return getPrimaryDecl(BO->getLHS()); 2337 } else if (BO->getRHS()->getType()->isPointerType()) { 2338 return getPrimaryDecl(BO->getRHS()); 2339 } 2340 } 2341 2342 return 0; 2343 } 2344 case Stmt::ParenExprClass: 2345 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2346 case Stmt::ImplicitCastExprClass: 2347 // &X[4] when X is an array, has an implicit cast from array to pointer. 2348 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2349 default: 2350 return 0; 2351 } 2352} 2353 2354/// CheckAddressOfOperand - The operand of & must be either a function 2355/// designator or an lvalue designating an object. If it is an lvalue, the 2356/// object cannot be declared with storage class register or be a bit field. 2357/// Note: The usual conversions are *not* applied to the operand of the & 2358/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2359QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2360 if (getLangOptions().C99) { 2361 // Implement C99-only parts of addressof rules. 2362 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2363 if (uOp->getOpcode() == UnaryOperator::Deref) 2364 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2365 // (assuming the deref expression is valid). 2366 return uOp->getSubExpr()->getType(); 2367 } 2368 // Technically, there should be a check for array subscript 2369 // expressions here, but the result of one is always an lvalue anyway. 2370 } 2371 ValueDecl *dcl = getPrimaryDecl(op); 2372 Expr::isLvalueResult lval = op->isLvalue(Context); 2373 2374 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2375 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2376 // FIXME: emit more specific diag... 2377 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2378 op->getSourceRange()); 2379 return QualType(); 2380 } 2381 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2382 if (MemExpr->getMemberDecl()->isBitField()) { 2383 Diag(OpLoc, diag::err_typecheck_address_of, 2384 std::string("bit-field"), op->getSourceRange()); 2385 return QualType(); 2386 } 2387 // Check for Apple extension for accessing vector components. 2388 } else if (isa<ArraySubscriptExpr>(op) && 2389 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2390 Diag(OpLoc, diag::err_typecheck_address_of, 2391 std::string("vector"), op->getSourceRange()); 2392 return QualType(); 2393 } else if (dcl) { // C99 6.5.3.2p1 2394 // We have an lvalue with a decl. Make sure the decl is not declared 2395 // with the register storage-class specifier. 2396 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2397 if (vd->getStorageClass() == VarDecl::Register) { 2398 Diag(OpLoc, diag::err_typecheck_address_of, 2399 std::string("register variable"), op->getSourceRange()); 2400 return QualType(); 2401 } 2402 } else 2403 assert(0 && "Unknown/unexpected decl type"); 2404 } 2405 2406 // If the operand has type "type", the result has type "pointer to type". 2407 return Context.getPointerType(op->getType()); 2408} 2409 2410QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2411 UsualUnaryConversions(op); 2412 QualType qType = op->getType(); 2413 2414 if (const PointerType *PT = qType->getAsPointerType()) { 2415 // Note that per both C89 and C99, this is always legal, even 2416 // if ptype is an incomplete type or void. 2417 // It would be possible to warn about dereferencing a 2418 // void pointer, but it's completely well-defined, 2419 // and such a warning is unlikely to catch any mistakes. 2420 return PT->getPointeeType(); 2421 } 2422 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2423 qType.getAsString(), op->getSourceRange()); 2424 return QualType(); 2425} 2426 2427static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2428 tok::TokenKind Kind) { 2429 BinaryOperator::Opcode Opc; 2430 switch (Kind) { 2431 default: assert(0 && "Unknown binop!"); 2432 case tok::star: Opc = BinaryOperator::Mul; break; 2433 case tok::slash: Opc = BinaryOperator::Div; break; 2434 case tok::percent: Opc = BinaryOperator::Rem; break; 2435 case tok::plus: Opc = BinaryOperator::Add; break; 2436 case tok::minus: Opc = BinaryOperator::Sub; break; 2437 case tok::lessless: Opc = BinaryOperator::Shl; break; 2438 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2439 case tok::lessequal: Opc = BinaryOperator::LE; break; 2440 case tok::less: Opc = BinaryOperator::LT; break; 2441 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2442 case tok::greater: Opc = BinaryOperator::GT; break; 2443 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2444 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2445 case tok::amp: Opc = BinaryOperator::And; break; 2446 case tok::caret: Opc = BinaryOperator::Xor; break; 2447 case tok::pipe: Opc = BinaryOperator::Or; break; 2448 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2449 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2450 case tok::equal: Opc = BinaryOperator::Assign; break; 2451 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2452 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2453 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2454 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2455 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2456 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2457 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2458 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2459 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2460 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2461 case tok::comma: Opc = BinaryOperator::Comma; break; 2462 } 2463 return Opc; 2464} 2465 2466static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2467 tok::TokenKind Kind) { 2468 UnaryOperator::Opcode Opc; 2469 switch (Kind) { 2470 default: assert(0 && "Unknown unary op!"); 2471 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2472 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2473 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2474 case tok::star: Opc = UnaryOperator::Deref; break; 2475 case tok::plus: Opc = UnaryOperator::Plus; break; 2476 case tok::minus: Opc = UnaryOperator::Minus; break; 2477 case tok::tilde: Opc = UnaryOperator::Not; break; 2478 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2479 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 2480 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 2481 case tok::kw___real: Opc = UnaryOperator::Real; break; 2482 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2483 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2484 } 2485 return Opc; 2486} 2487 2488// Binary Operators. 'Tok' is the token for the operator. 2489Action::ExprResult Sema::ActOnBinOp(SourceLocation TokLoc, tok::TokenKind Kind, 2490 ExprTy *LHS, ExprTy *RHS) { 2491 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2492 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2493 2494 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2495 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2496 2497 QualType ResultTy; // Result type of the binary operator. 2498 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2499 2500 switch (Opc) { 2501 default: 2502 assert(0 && "Unknown binary expr!"); 2503 case BinaryOperator::Assign: 2504 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, QualType()); 2505 break; 2506 case BinaryOperator::Mul: 2507 case BinaryOperator::Div: 2508 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc); 2509 break; 2510 case BinaryOperator::Rem: 2511 ResultTy = CheckRemainderOperands(lhs, rhs, TokLoc); 2512 break; 2513 case BinaryOperator::Add: 2514 ResultTy = CheckAdditionOperands(lhs, rhs, TokLoc); 2515 break; 2516 case BinaryOperator::Sub: 2517 ResultTy = CheckSubtractionOperands(lhs, rhs, TokLoc); 2518 break; 2519 case BinaryOperator::Shl: 2520 case BinaryOperator::Shr: 2521 ResultTy = CheckShiftOperands(lhs, rhs, TokLoc); 2522 break; 2523 case BinaryOperator::LE: 2524 case BinaryOperator::LT: 2525 case BinaryOperator::GE: 2526 case BinaryOperator::GT: 2527 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, true); 2528 break; 2529 case BinaryOperator::EQ: 2530 case BinaryOperator::NE: 2531 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, false); 2532 break; 2533 case BinaryOperator::And: 2534 case BinaryOperator::Xor: 2535 case BinaryOperator::Or: 2536 ResultTy = CheckBitwiseOperands(lhs, rhs, TokLoc); 2537 break; 2538 case BinaryOperator::LAnd: 2539 case BinaryOperator::LOr: 2540 ResultTy = CheckLogicalOperands(lhs, rhs, TokLoc); 2541 break; 2542 case BinaryOperator::MulAssign: 2543 case BinaryOperator::DivAssign: 2544 CompTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc, true); 2545 if (!CompTy.isNull()) 2546 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2547 break; 2548 case BinaryOperator::RemAssign: 2549 CompTy = CheckRemainderOperands(lhs, rhs, TokLoc, true); 2550 if (!CompTy.isNull()) 2551 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2552 break; 2553 case BinaryOperator::AddAssign: 2554 CompTy = CheckAdditionOperands(lhs, rhs, TokLoc, true); 2555 if (!CompTy.isNull()) 2556 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2557 break; 2558 case BinaryOperator::SubAssign: 2559 CompTy = CheckSubtractionOperands(lhs, rhs, TokLoc, true); 2560 if (!CompTy.isNull()) 2561 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2562 break; 2563 case BinaryOperator::ShlAssign: 2564 case BinaryOperator::ShrAssign: 2565 CompTy = CheckShiftOperands(lhs, rhs, TokLoc, true); 2566 if (!CompTy.isNull()) 2567 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2568 break; 2569 case BinaryOperator::AndAssign: 2570 case BinaryOperator::XorAssign: 2571 case BinaryOperator::OrAssign: 2572 CompTy = CheckBitwiseOperands(lhs, rhs, TokLoc, true); 2573 if (!CompTy.isNull()) 2574 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2575 break; 2576 case BinaryOperator::Comma: 2577 ResultTy = CheckCommaOperands(lhs, rhs, TokLoc); 2578 break; 2579 } 2580 if (ResultTy.isNull()) 2581 return true; 2582 if (CompTy.isNull()) 2583 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2584 else 2585 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, TokLoc); 2586} 2587 2588// Unary Operators. 'Tok' is the token for the operator. 2589Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2590 ExprTy *input) { 2591 Expr *Input = (Expr*)input; 2592 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2593 QualType resultType; 2594 switch (Opc) { 2595 default: 2596 assert(0 && "Unimplemented unary expr!"); 2597 case UnaryOperator::PreInc: 2598 case UnaryOperator::PreDec: 2599 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2600 break; 2601 case UnaryOperator::AddrOf: 2602 resultType = CheckAddressOfOperand(Input, OpLoc); 2603 break; 2604 case UnaryOperator::Deref: 2605 DefaultFunctionArrayConversion(Input); 2606 resultType = CheckIndirectionOperand(Input, OpLoc); 2607 break; 2608 case UnaryOperator::Plus: 2609 case UnaryOperator::Minus: 2610 UsualUnaryConversions(Input); 2611 resultType = Input->getType(); 2612 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2613 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2614 resultType.getAsString()); 2615 break; 2616 case UnaryOperator::Not: // bitwise complement 2617 UsualUnaryConversions(Input); 2618 resultType = Input->getType(); 2619 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2620 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2621 // C99 does not support '~' for complex conjugation. 2622 Diag(OpLoc, diag::ext_integer_complement_complex, 2623 resultType.getAsString(), Input->getSourceRange()); 2624 else if (!resultType->isIntegerType()) 2625 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2626 resultType.getAsString(), Input->getSourceRange()); 2627 break; 2628 case UnaryOperator::LNot: // logical negation 2629 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2630 DefaultFunctionArrayConversion(Input); 2631 resultType = Input->getType(); 2632 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2633 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2634 resultType.getAsString()); 2635 // LNot always has type int. C99 6.5.3.3p5. 2636 resultType = Context.IntTy; 2637 break; 2638 case UnaryOperator::SizeOf: 2639 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2640 Input->getSourceRange(), true); 2641 break; 2642 case UnaryOperator::AlignOf: 2643 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2644 Input->getSourceRange(), false); 2645 break; 2646 case UnaryOperator::Real: 2647 case UnaryOperator::Imag: 2648 resultType = CheckRealImagOperand(Input, OpLoc); 2649 break; 2650 case UnaryOperator::Extension: 2651 resultType = Input->getType(); 2652 break; 2653 } 2654 if (resultType.isNull()) 2655 return true; 2656 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2657} 2658 2659/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2660Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2661 SourceLocation LabLoc, 2662 IdentifierInfo *LabelII) { 2663 // Look up the record for this label identifier. 2664 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2665 2666 // If we haven't seen this label yet, create a forward reference. It 2667 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 2668 if (LabelDecl == 0) 2669 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2670 2671 // Create the AST node. The address of a label always has type 'void*'. 2672 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2673 Context.getPointerType(Context.VoidTy)); 2674} 2675 2676Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2677 SourceLocation RPLoc) { // "({..})" 2678 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2679 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2680 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2681 2682 // FIXME: there are a variety of strange constraints to enforce here, for 2683 // example, it is not possible to goto into a stmt expression apparently. 2684 // More semantic analysis is needed. 2685 2686 // FIXME: the last statement in the compount stmt has its value used. We 2687 // should not warn about it being unused. 2688 2689 // If there are sub stmts in the compound stmt, take the type of the last one 2690 // as the type of the stmtexpr. 2691 QualType Ty = Context.VoidTy; 2692 2693 if (!Compound->body_empty()) { 2694 Stmt *LastStmt = Compound->body_back(); 2695 // If LastStmt is a label, skip down through into the body. 2696 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 2697 LastStmt = Label->getSubStmt(); 2698 2699 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 2700 Ty = LastExpr->getType(); 2701 } 2702 2703 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2704} 2705 2706Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2707 SourceLocation TypeLoc, 2708 TypeTy *argty, 2709 OffsetOfComponent *CompPtr, 2710 unsigned NumComponents, 2711 SourceLocation RPLoc) { 2712 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2713 assert(!ArgTy.isNull() && "Missing type argument!"); 2714 2715 // We must have at least one component that refers to the type, and the first 2716 // one is known to be a field designator. Verify that the ArgTy represents 2717 // a struct/union/class. 2718 if (!ArgTy->isRecordType()) 2719 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2720 2721 // Otherwise, create a compound literal expression as the base, and 2722 // iteratively process the offsetof designators. 2723 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2724 2725 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2726 // GCC extension, diagnose them. 2727 if (NumComponents != 1) 2728 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2729 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2730 2731 for (unsigned i = 0; i != NumComponents; ++i) { 2732 const OffsetOfComponent &OC = CompPtr[i]; 2733 if (OC.isBrackets) { 2734 // Offset of an array sub-field. TODO: Should we allow vector elements? 2735 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 2736 if (!AT) { 2737 delete Res; 2738 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2739 Res->getType().getAsString()); 2740 } 2741 2742 // FIXME: C++: Verify that operator[] isn't overloaded. 2743 2744 // C99 6.5.2.1p1 2745 Expr *Idx = static_cast<Expr*>(OC.U.E); 2746 if (!Idx->getType()->isIntegerType()) 2747 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2748 Idx->getSourceRange()); 2749 2750 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 2751 continue; 2752 } 2753 2754 const RecordType *RC = Res->getType()->getAsRecordType(); 2755 if (!RC) { 2756 delete Res; 2757 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 2758 Res->getType().getAsString()); 2759 } 2760 2761 // Get the decl corresponding to this. 2762 RecordDecl *RD = RC->getDecl(); 2763 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 2764 if (!MemberDecl) 2765 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 2766 OC.U.IdentInfo->getName(), 2767 SourceRange(OC.LocStart, OC.LocEnd)); 2768 2769 // FIXME: C++: Verify that MemberDecl isn't a static field. 2770 // FIXME: Verify that MemberDecl isn't a bitfield. 2771 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 2772 // matter here. 2773 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, MemberDecl->getType()); 2774 } 2775 2776 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 2777 BuiltinLoc); 2778} 2779 2780 2781Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 2782 TypeTy *arg1, TypeTy *arg2, 2783 SourceLocation RPLoc) { 2784 QualType argT1 = QualType::getFromOpaquePtr(arg1); 2785 QualType argT2 = QualType::getFromOpaquePtr(arg2); 2786 2787 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 2788 2789 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 2790} 2791 2792Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 2793 ExprTy *expr1, ExprTy *expr2, 2794 SourceLocation RPLoc) { 2795 Expr *CondExpr = static_cast<Expr*>(cond); 2796 Expr *LHSExpr = static_cast<Expr*>(expr1); 2797 Expr *RHSExpr = static_cast<Expr*>(expr2); 2798 2799 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 2800 2801 // The conditional expression is required to be a constant expression. 2802 llvm::APSInt condEval(32); 2803 SourceLocation ExpLoc; 2804 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 2805 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 2806 CondExpr->getSourceRange()); 2807 2808 // If the condition is > zero, then the AST type is the same as the LSHExpr. 2809 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 2810 RHSExpr->getType(); 2811 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 2812} 2813 2814//===----------------------------------------------------------------------===// 2815// Clang Extensions. 2816//===----------------------------------------------------------------------===// 2817 2818/// ActOnBlockStart - This callback is invoked when a block literal is started. 2819void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 2820 // Analyze block parameters. 2821 BlockSemaInfo *BSI = new BlockSemaInfo(); 2822 2823 // Add BSI to CurBlock. 2824 BSI->PrevBlockInfo = CurBlock; 2825 CurBlock = BSI; 2826 2827 BSI->ReturnType = 0; 2828 BSI->TheScope = BlockScope; 2829 2830 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 2831 PushDeclContext(BSI->TheDecl); 2832} 2833 2834void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 2835 // Analyze arguments to block. 2836 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 2837 "Not a function declarator!"); 2838 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 2839 2840 CurBlock->hasPrototype = FTI.hasPrototype; 2841 CurBlock->isVariadic = true; 2842 2843 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 2844 // no arguments, not a function that takes a single void argument. 2845 if (FTI.hasPrototype && 2846 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2847 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 2848 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 2849 // empty arg list, don't push any params. 2850 CurBlock->isVariadic = false; 2851 } else if (FTI.hasPrototype) { 2852 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2853 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 2854 CurBlock->isVariadic = FTI.isVariadic; 2855 } 2856 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 2857 2858 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 2859 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 2860 // If this has an identifier, add it to the scope stack. 2861 if ((*AI)->getIdentifier()) 2862 PushOnScopeChains(*AI, CurBlock->TheScope); 2863} 2864 2865/// ActOnBlockError - If there is an error parsing a block, this callback 2866/// is invoked to pop the information about the block from the action impl. 2867void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 2868 // Ensure that CurBlock is deleted. 2869 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 2870 2871 // Pop off CurBlock, handle nested blocks. 2872 CurBlock = CurBlock->PrevBlockInfo; 2873 2874 // FIXME: Delete the ParmVarDecl objects as well??? 2875 2876} 2877 2878/// ActOnBlockStmtExpr - This is called when the body of a block statement 2879/// literal was successfully completed. ^(int x){...} 2880Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 2881 Scope *CurScope) { 2882 // Ensure that CurBlock is deleted. 2883 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 2884 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 2885 2886 PopDeclContext(); 2887 2888 // Pop off CurBlock, handle nested blocks. 2889 CurBlock = CurBlock->PrevBlockInfo; 2890 2891 QualType RetTy = Context.VoidTy; 2892 if (BSI->ReturnType) 2893 RetTy = QualType(BSI->ReturnType, 0); 2894 2895 llvm::SmallVector<QualType, 8> ArgTypes; 2896 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 2897 ArgTypes.push_back(BSI->Params[i]->getType()); 2898 2899 QualType BlockTy; 2900 if (!BSI->hasPrototype) 2901 BlockTy = Context.getFunctionTypeNoProto(RetTy); 2902 else 2903 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 2904 BSI->isVariadic); 2905 2906 BlockTy = Context.getBlockPointerType(BlockTy); 2907 2908 BSI->TheDecl->setBody(Body.take()); 2909 return new BlockExpr(BSI->TheDecl, BlockTy); 2910} 2911 2912/// ExprsMatchFnType - return true if the Exprs in array Args have 2913/// QualTypes that match the QualTypes of the arguments of the FnType. 2914/// The number of arguments has already been validated to match the number of 2915/// arguments in FnType. 2916static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 2917 ASTContext &Context) { 2918 unsigned NumParams = FnType->getNumArgs(); 2919 for (unsigned i = 0; i != NumParams; ++i) { 2920 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 2921 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 2922 2923 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 2924 return false; 2925 } 2926 return true; 2927} 2928 2929Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 2930 SourceLocation *CommaLocs, 2931 SourceLocation BuiltinLoc, 2932 SourceLocation RParenLoc) { 2933 // __builtin_overload requires at least 2 arguments 2934 if (NumArgs < 2) 2935 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2936 SourceRange(BuiltinLoc, RParenLoc)); 2937 2938 // The first argument is required to be a constant expression. It tells us 2939 // the number of arguments to pass to each of the functions to be overloaded. 2940 Expr **Args = reinterpret_cast<Expr**>(args); 2941 Expr *NParamsExpr = Args[0]; 2942 llvm::APSInt constEval(32); 2943 SourceLocation ExpLoc; 2944 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 2945 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2946 NParamsExpr->getSourceRange()); 2947 2948 // Verify that the number of parameters is > 0 2949 unsigned NumParams = constEval.getZExtValue(); 2950 if (NumParams == 0) 2951 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2952 NParamsExpr->getSourceRange()); 2953 // Verify that we have at least 1 + NumParams arguments to the builtin. 2954 if ((NumParams + 1) > NumArgs) 2955 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2956 SourceRange(BuiltinLoc, RParenLoc)); 2957 2958 // Figure out the return type, by matching the args to one of the functions 2959 // listed after the parameters. 2960 OverloadExpr *OE = 0; 2961 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 2962 // UsualUnaryConversions will convert the function DeclRefExpr into a 2963 // pointer to function. 2964 Expr *Fn = UsualUnaryConversions(Args[i]); 2965 const FunctionTypeProto *FnType = 0; 2966 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 2967 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 2968 2969 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 2970 // parameters, and the number of parameters must match the value passed to 2971 // the builtin. 2972 if (!FnType || (FnType->getNumArgs() != NumParams)) 2973 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 2974 Fn->getSourceRange()); 2975 2976 // Scan the parameter list for the FunctionType, checking the QualType of 2977 // each parameter against the QualTypes of the arguments to the builtin. 2978 // If they match, return a new OverloadExpr. 2979 if (ExprsMatchFnType(Args+1, FnType, Context)) { 2980 if (OE) 2981 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 2982 OE->getFn()->getSourceRange()); 2983 // Remember our match, and continue processing the remaining arguments 2984 // to catch any errors. 2985 OE = new OverloadExpr(Args, NumArgs, i, FnType->getResultType(), 2986 BuiltinLoc, RParenLoc); 2987 } 2988 } 2989 // Return the newly created OverloadExpr node, if we succeded in matching 2990 // exactly one of the candidate functions. 2991 if (OE) 2992 return OE; 2993 2994 // If we didn't find a matching function Expr in the __builtin_overload list 2995 // the return an error. 2996 std::string typeNames; 2997 for (unsigned i = 0; i != NumParams; ++i) { 2998 if (i != 0) typeNames += ", "; 2999 typeNames += Args[i+1]->getType().getAsString(); 3000 } 3001 3002 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 3003 SourceRange(BuiltinLoc, RParenLoc)); 3004} 3005 3006Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3007 ExprTy *expr, TypeTy *type, 3008 SourceLocation RPLoc) { 3009 Expr *E = static_cast<Expr*>(expr); 3010 QualType T = QualType::getFromOpaquePtr(type); 3011 3012 InitBuiltinVaListType(); 3013 3014 // Get the va_list type 3015 QualType VaListType = Context.getBuiltinVaListType(); 3016 // Deal with implicit array decay; for example, on x86-64, 3017 // va_list is an array, but it's supposed to decay to 3018 // a pointer for va_arg. 3019 if (VaListType->isArrayType()) 3020 VaListType = Context.getArrayDecayedType(VaListType); 3021 // Make sure the input expression also decays appropriately. 3022 UsualUnaryConversions(E); 3023 3024 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3025 return Diag(E->getLocStart(), 3026 diag::err_first_argument_to_va_arg_not_of_type_va_list, 3027 E->getType().getAsString(), 3028 E->getSourceRange()); 3029 3030 // FIXME: Warn if a non-POD type is passed in. 3031 3032 return new VAArgExpr(BuiltinLoc, E, T, RPLoc); 3033} 3034 3035bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3036 SourceLocation Loc, 3037 QualType DstType, QualType SrcType, 3038 Expr *SrcExpr, const char *Flavor) { 3039 // Decode the result (notice that AST's are still created for extensions). 3040 bool isInvalid = false; 3041 unsigned DiagKind; 3042 switch (ConvTy) { 3043 default: assert(0 && "Unknown conversion type"); 3044 case Compatible: return false; 3045 case PointerToInt: 3046 DiagKind = diag::ext_typecheck_convert_pointer_int; 3047 break; 3048 case IntToPointer: 3049 DiagKind = diag::ext_typecheck_convert_int_pointer; 3050 break; 3051 case IncompatiblePointer: 3052 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3053 break; 3054 case FunctionVoidPointer: 3055 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3056 break; 3057 case CompatiblePointerDiscardsQualifiers: 3058 // If the qualifiers lost were because we were applying the 3059 // (deprecated) C++ conversion from a string literal to a char* 3060 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3061 // Ideally, this check would be performed in 3062 // CheckPointerTypesForAssignment. However, that would require a 3063 // bit of refactoring (so that the second argument is an 3064 // expression, rather than a type), which should be done as part 3065 // of a larger effort to fix CheckPointerTypesForAssignment for 3066 // C++ semantics. 3067 if (getLangOptions().CPlusPlus && 3068 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3069 return false; 3070 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3071 break; 3072 case IntToBlockPointer: 3073 DiagKind = diag::err_int_to_block_pointer; 3074 break; 3075 case IncompatibleBlockPointer: 3076 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3077 break; 3078 case BlockVoidPointer: 3079 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 3080 break; 3081 case Incompatible: 3082 DiagKind = diag::err_typecheck_convert_incompatible; 3083 isInvalid = true; 3084 break; 3085 } 3086 3087 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 3088 SrcExpr->getSourceRange()); 3089 return isInvalid; 3090} 3091